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MONEL 400（UNSN04400） Sheet / Plate
Nickel-Copper Alloy for Seawater, Hydrofluoric Acid & Reducing Media Service
MONEL 400 sheet and plate is a nickel-copper solid-solution alloy (UNS N04400) recognized for excellent corrosion resistance in seawater, brackish water, hydrofluoric acid, and many reducing chemicals. It combines good strength and toughness across a wide temperature range and is commonly used for chemical processing equipment, marine structures, and heat-exchanger components.
As a professional Chinese nickel-based alloy manufacturer, we supply MONEL 400 sheet and plate with stable chemistry, consistent mechanical properties, and flexible dimensional customization for global industrial users.
Typical supply range (custom sizes and tolerances available upon request):
Item | Range / Options | Notes |
Thickness | 0.5 – 50 mm | Sheet typically ≤ 6 mm; Plate typically ≥ 6 mm (project-defined). |
Width | Up to 2000 mm | Slitting available; define tolerance if critical. |
Length | Up to 6000 mm | Cut-to-length (shearing) by agreement; define tolerance if critical. |
Surface finish | 2B / No.1 / BA / Polished | PVC protective film optional for surface-critical parts. |
Edge | Mill edge / Slit edge | Deburring / edge conditioning available. |
Flatness / tolerance | Per ASTM/EN or as agreed | Define flatness for welded assemblies and heat exchangers. |
Delivery condition | Annealed (standard) | Pickled/bright depending on thickness/finish. |
Dimension definition: THK × WIDTH × LENGTH.
• Excellent corrosion resistance in flowing seawater and brackish water
• Outstanding resistance to hydrofluoric acid (HF) across wide concentrations
• Good resistance to alkalis, neutral salts, and many reducing media
• Resistant to stress corrosion cracking in most fresh and industrial waters
• High strength and toughness; remains ductile at subzero temperatures
• Can be strengthened by cold working; good fabrication and weldability
Element | Ni | Cu | Fe | Mn | Si | C | S | Others |
MONEL 400 | ≥63.0 | 28.0–34.0 | ≤2.50 | ≤2.00 | ≤0.50 | ≤0.30 | ≤0.024 | — |
Alloy 400 is a Ni-Cu solid-solution alloy (non age-hardenable) that can only be strengthened by cold working; controlled chemistry supports stable corrosion performance.
Property | Value |
Tensile Strength (Rm) | ≈ 517–620 MPa (annealed) |
Yield Strength (Rp0.2) | ≈ 172–345 MPa (annealed) |
Elongation | ≈ 35–60 % |
Hardness | ≈ 60–80 HRB |
Mechanical properties may vary slightly with product form and heat treatment condition.
Standard System | Specification |
ASTM / ASME | ASTM B127 / ASME SB-127 |
EN | EN 10204 |
UNS | N04400 |
DIN | 2.4360 |
JIS | NW 4400 |
Item | Range |
Thickness | 0.5 – 50 mm |
Width | up to 2000 mm |
Length | up to 6000 mm |
Surface Finish | 2B / BA / No.1 / Polished |
Edge | Mill edge / Slit edge |
Custom sizes, tight tolerances, and cut-to-length service are available upon request.
• Solution Annealed
• Bright Annealed / Pickled (where applicable)
• Chemical processing vessels, tanks, and lined components
• Heat-exchanger plates and corrosion-resistant cladding
• Marine structures and seawater-exposed components
• Hydrofluoric acid (HF) alkylation and related chemical service equipment
MONEL 400 can be readily fabricated and welded using standard nickel-alloy practices.
Common welding methods include:
• GTAW (TIG)
• GMAW (MIG)
• SMAW
Matching filler metals such as ERNiCrMo-2 are typically recommended.
• EN 10204 3.1 Material Test Certificate
• Chemical composition analysis
• Mechanical testing (tensile, hardness)
• PMI / XRF testing available
• Dimensional inspection
• Third-party inspection on request (BV, SGS, TUV, DNV)
• PVC protective film on surface (where applicable)
• Wooden pallets or export-grade crates
• Seaworthy packaging for long-distance shipment
• Global delivery by sea, air, or multimodal transport
• Professional nickel-based alloy manufacturer in China
• Stable raw material sourcing and melting control
• Wide stock and fast production cycle
• Competitive pricing for global projects
• Experience with international EPC, OEM, and distributors
For quotation or technical consultation, please provide:
• Required grade (MONEL 400)
• Thickness × Width × Length
• Quantity
• Surface finish / delivery condition
• Application environment
Our technical team will respond with datasheets, pricing, and delivery schedule promptly.
